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L'operazione di assegnamento b = a produce

  • Se le variabili si riferiscono a tipi primitivi, la copia del contenuto di a in b .
  • Se le variabili si riferiscono a oggetti o array, la creazione di un nuovoriferimento allo stesso oggetto o array.

Per avere chiaro il significato di termini informatici quali, ad esempio, quelli che seguono, si consiglia di cercare in Wikipedia
all'interno di un programma, regione in cui si può accedere ad una variabile e modificarne il valore
global scope
definita fuori da setup() e draw(), la variabile è visibile e usabile ovunque nel programma
local scope
definita all'interno di un blocco di codice o di una funzione, la variabile assumevalori locali al blocco o alla funzione, ed eventuali valori assunti da una variabile globale omonima vengonoignorati

Dichiarazione e allocazione di un array

int[] arrayDiInteri = new int[10];

Strutture di programmazione

Istruzioni condizionali

  • if: if (i == NMAX) { println("finito");} else {i++; }


  • while: int i = 0; //contatore intero while (i < 10) { //scrivi i numeri da 0 a 9 println("i = "+ i); i++; }
  • for: for (int i = 0; i < 10; i++) { //scrivi i numeri da 0 a 9 println("i = "+ i); }

Inizializzazione di una tabella di numeri casuali

int MAX = 10; float[] tabella = new float[MAX]; for (int i = 0; i < MAX; i++) tabella[i] = random(1); //random numbers between 0 and 1 println(tabella.length + " elementi:"); println(tabella);


Le funzioni consentono un approccio modulare alla programmazione. In Processing, in modalità di programmazione intermediate , si possono definire funzioni oltre alla setup() e draw() , usabili all'interno della setup() e della draw() .

Esempio di funzione

int raddoppia(int i) { return 2*i; }

Una funzione è caratterizzata dalle seguenti entità (con riferimento all' esempio ) :

  • tipo di ritorno ( int )
  • nome di funzione ( raddoppia )
  • parametri ( i )
  • corpo della funzione ( return 2*i )

Classi e oggetti

Una classe è definita da un insieme di dati e funzioni. Un oggetto è una istanza di una classe. Viceversa, una classe èuna descrizione astratta di un insieme di oggetti.

Per una introduzione ai concetti di oggetto e di classe si veda Objects and Classes .

Esempio di classe

Dot myDot; void setup() { size(300,20); colorMode(RGB,255,255,255,100); color tempcolor = color(255,0,0); myDot = new Dot(tempcolor,0); } void draw() { background(0); myDot.draw(10); } class Dot { color colore; int posizione; //****CONSTRUCTOR*****// Dot(color c_, int xp) { colore = c_; posizione = xp; } void draw (int ypos) { rectMode(CENTER); fill(colore); rect(posizione,ypos,20,10); } }

Una classe è caratterizzata dalle seguenti entità (con riferimento all' esempio ) :

  • nome di classe ( Dot )
  • dati ( colore, posizione )
  • costruttore ( Dot() )
  • funzioni (o metodi, draw() )

Un oggetto (istanza di una classe) è dichiarato nello stesso modo in cui si dichiara una variabile, ma ad esso va poiallocato uno spazio (come si è visto per gli array) tramite il suo costruttore (con riferimento all' esempio ).

  • Dichiarazione: ( Dot myDot; )
  • Allocazione: ( myDot = new Dot(tempcolor,0) )
  • Utilizzazione: ( myDot.draw(10); )

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Programmazione di artefatti interattivi. OpenStax CNX. Dec 09, 2010 Download for free at http://cnx.org/content/col10417/1.9
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